US2538568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complex copper compounds of disazo dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1948-06-07
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Granted: 1951-01-16
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Expires: 1968-06-07
Abstract
No abstract record available.
Inventors
- 👤 Kaiser Otto
- 👤 Widmer Willy
- 👤 Buehler Arthur
- 👤 Zickendraht Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/24; C09B45/28; Y; Y10; Y10S; Y10S534/00; Y10S534/01; Y10S8/00; Y10S8/916; Y10S8/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COMPLEX COPPER COMPOUND OF A DISAZO DYESTUFF OF THE GENERAL FORMULA
Claim 2
Dependent Claim
12 words
A COMPLEX COPPER COMPOUND OF A DISAZO DYESTUFF OF THE GENERAL FORMULA
References Cited (Backward Citations)
US1338414A
Cited
US1994116A
Cited
US2217693A
Cited
US2317365A
Cited
US2393652A
Cited
US2390152A
Cited
US2438754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |